Pocket tester, 12 Volt easy to use with excellent and fast results Indications: - battery voltage: 25% - from 9.8 V to 12.0 V. 50% - from 12.0 V to 12.4 V. 75% - 12.4 V to 12.6 V. 100% 12.6 V to 13.8 V. - charging voltage ok - 13.8 V to 14.7 V, defective - over 14.7 VNB The black cable (negative) can be removed from the existing position in order to reach the battery poles for testing.